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MHT CET 2024 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2024

When a metallic surface is illuminated with a radiation of wavelength 'λ', the stopping potential is 'V'. If the same surface is illuminated with radiation of wavelength '3λ' the stopping potential is . The threshold wavelength for the surface is

Answer: (C)

Solution

Einstein's equation: . Case 1: . Case 2: . Substituting from case 1 into case 2: . Multiply by 6:

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Question ID VK-092723